Gomes, 27, saw his first Major League action in 2011, making 40 appearances over two stints in his first season in the Rays' system. He was delayed in Spring Training due to his recovery from offseason back surgery.
Gomes was 0-0 with a 0.00 ERA in five appearances for the Bulls this season.
Cobb, 24, is a starter, but he was recalled on Sunday as insurance for the bullpen. He did not pitch during his two-day stint with Tampa Bay.
Cobb is 0-1 with a 2.25 ERA in two starts for the Bulls this season. He made 12 starts with Durham and nine for the Rays over three stints in the Major Leagues in 2011. Logging his first experience in The Show, Cobb was impressive while posting a 3-2 record with a 3.42 ERA.
On Aug. 18, Cobb had season-ending surgery to remove a blood clot and blockage in the area of his first right rib.